Polyphosphazene was synthesized by ultrasonic using 4,4-diaminodiphenyl ether and hexachlorocyclotriphosphazene (HCCP) as precursors. Next, it was further carbonized and functionalized to prepare the carboxylic-acid functionalized N, P co-doped carbon materials (NPCs-COOH). The structure of NPCs-COOH was characterized by FTIR , SEM and XPS . The sorption performance of NPCs-COOH for U(VI) in solution were determined under diverse factors including pH values, initial concentration, equilibrium time and reaction temperature. The results indicated that the optimal pH value was 5.0 and the equilibrium time was 60.0 min. The maximum sorption capacity from experimental results was 425.16 mg/g. The analysis results of the sorption thermodynamics and kinetics showed that the NPCs-COOH had excellent sorption performance so that it can be utilized on removal of U(VI) effectively in aqueous solution.
Transition metal oxides as potential anodes of lithium-ion batteries (LIBs) possess high theoretical capacity but suffer from large volume expansion and poor conductivity. To overcome these drawbacks, we designed and fabricated polyphosphazene-coated yolk-shelled CoMoO 4 nanospheres , in which polyphosphazene with abundant C/P/S/N species was readily converted into carbon shells and provided P/S/N dopants. This resulted in the formation of P/S/N co-doped carbon-coated yolk-shelled CoMoO 4 nanospheres (PSN-C@CoMoO 4 ). The PSN-C@CoMoO 4 electrode exhibits superior cycle stability of 439.2 mA h g −1 at 1000 mA g −1 after 500 cycles and rate capability of 470.1 mA h g −1 at 2000 mA g −1 . The electrochemical and structural analyses reveal that PSN-C@CoMoO 4 with yolk-shell structure, coated with carbon and doped with heteroatom not only greatly enhances the charge transfer rate and reaction kinetics, but also efficiently buffers the volume variation upon lithiation/delithiation cycling. Importantly, the use of polyphosphazene as coating/doping agent can be a general strategy for developing advanced electrode materials.
危险品化学品经营许可证（带存储）